Method for measuring gas flow through ultrasonic flowmeter

A gas flow and flow measurement technology, applied in the field of metering instruments, can solve problems such as flow measurement error and gas flow disturbance, and achieve the effects of high measurement accuracy, accurate measurement of gas flow, and real-time monitoring of pipe network status.

Active Publication Date: 2017-05-24
杭州思筑智能设备有限公司
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0005] However, in the patent document of this invention, the static velocity tube needs to be inserted into the gas pipeline to measure the gas flow, and the static velocity tube itself will disturb the gas flow, thus causing the error of the flow measurement

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  • Method for measuring gas flow through ultrasonic flowmeter

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Embodiment Construction

[0040] The method for measuring the gas flow rate by using an ultrasonic flowmeter according to the present invention will be described in detail below in conjunction with the accompanying drawings.

[0041] The present invention utilizes ultrasonic flow meter to measure the principle of gas flow as follows:

[0042] During the process from the ultrasonic signal sent by the ultrasonic probe upstream of the air flow to the ultrasonic probe downstream of the air flow receiving the ultrasonic signal, because the gas flow generates a velocity component in the transmission direction of the ultrasonic signal, the transmission of the ultrasonic signal will be accelerated; During the process of receiving the ultrasonic signal from the ultrasonic signal to the ultrasonic probe upstream of the gas flow, the gas flow generates a velocity component in the transmission direction of the ultrasonic signal, which will slow down the transmission of the ultrasonic signal, and use the ultrasonic si...

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Abstract

The invention discloses a method for measuring gas flow through an ultrasonic flowmeter. The method comprises the following steps that an ultrasonic transceiving device of the ultrasonic flowmeter is arranged around a gas pipeline in a surrounding mode, ultrasonic waves are transmitted, an echo signal is collected, and the maximum amplitude V0 of the echo signal is calculated according to sampling data of the echo signal; if the maximum amplitude V0 is within an amplitude range [VL,VH], the transmission time of the ultrasonic waves is calculated by taking an early moment that the second wave in the echo signal intersects with a first triggering threshold VTH0 as a datum moment of the ultrasonic waves; otherwise, the maximum amplitude V is calculated according to the formula V=A(X).V0, and the transmission time of the ultrasonic waves is calculated by taking an early moment that the second wave in the echo signal intersects with a second triggering threshold VTH as a datum moment of the ultrasonic waves; the gas flow is calculated through the transmission time. According to the method, the gas flow can be precisely measured, the pipe network state is monitored in real time, and an in-time response is provided for a natural gas transmission and distribution abnormality.

Description

technical field [0001] The invention relates to the technical field of measuring instruments, in particular to a method for measuring gas flow by using an ultrasonic flowmeter. Background technique [0002] As people pay more and more attention to the environment, natural gas as a clean and environmentally friendly green energy has received more and more attention and application, and the natural gas industry will develop rapidly in the future for a long time. In order to meet the development needs of the natural gas industry, especially the development needs of gas companies for natural gas metering and pipeline network transmission and distribution management, under the background of the development of information technology, an intelligent flowmeter system with accurate measurement, stable work, and remote management functions Began to enter into natural gas metering and transmission and distribution management. [0003] At present, the flowmeters used in natural gas mea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01F1/66
Inventor 朱赵君
Owner 杭州思筑智能设备有限公司
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